Start on selection boxes for inventions

they don't update properly after selecting
Selection boxes implemented
Inventions now work while clicked
Scientist default speed changed from 4 to 3
Invention selection box updates properly

default x jump velocity changed from 12 to 11
Fixes #25
Merge branch 'feature/AI' of github.com:DAWacker/SleepyScientist into develop

Conflicts:
	SleepyScientist/SleepyScientist/GameConstants.cs
	SleepyScientist/SleepyScientist/Scientist.cs